What types of changes are typically involved in equilibrium reactions? A. pressure only B. temperature only C. pressure or temperature D. pressure, temperature, or concentration

The correct answer is option D. i. e. pressure, temperature, or concentration.

Equilibrium reactions can involve

1) changes in the temperature conditions - high or low or exothermic or endothermic.

2) Pressure - By increasing or decreasing the pressure

3) Concentration - the changes in concentration take place in either products side or reactants side.